feat: add UserContextMenuInteraction and MessageContextMenuInteraction (#7003)

Co-authored-by: Rodry <38259440+ImRodry@users.noreply.github.com>
Co-authored-by: Suneet Tipirneni <77477100+suneettipirneni@users.noreply.github.com>
Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>
Co-authored-by: GrapeColor <grapecolor@users.noreply.github.com>

src/structures/UserContextMenuInteraction.js

@@ -0,0 +1,29 @@
+'use strict';
+
+const ContextMenuInteraction = require('./ContextMenuInteraction');
+
+/**
+ * Represents a user context menu interaction.
+ * @extends {ContextMenuInteraction}
+ */
+class UserContextMenuInteraction extends ContextMenuInteraction {
+  /**
+   * The user this interaction was sent from
+   * @type {User}
+   * @readonly
+   */
+  get targetUser() {
+    return this.options.getUser('user');
+  }
+
+  /**
+   * The member this interaction was sent from
+   * @type {?(GuildMember|APIGuildMember)}
+   * @readonly
+   */
+  get targetMember() {
+    return this.options.getMember('user');
+  }
+}
+
+module.exports = UserContextMenuInteraction;